searxng/searx/webapp.py
Noemi Vanyi fe691a0988 new preferences handling
Preferences class was introduced in order to handle user preferences. Right now
it parses cookies and the form in preferences. Also it can retrieve settings
based on the name of the setting.

ATTENTION
Please note that engine preferences are handled differently from now on. So it
introduces incompatible changes. Every user who has saved preferences should reset and
save his/her settings again.

This change was needed, because everytime a default disabled engine was
added saved user preferences would broke. Now engine setting tracking is
fixed.
2016-04-09 01:08:44 +02:00

743 lines
24 KiB
Python

#!/usr/bin/env python
'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
searx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.
(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
'''
if __name__ == '__main__':
from sys import path
from os.path import realpath, dirname
path.append(realpath(dirname(realpath(__file__)) + '/../'))
import json
import cStringIO
import os
import hashlib
import requests
from searx import logger
logger = logger.getChild('webapp')
try:
from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments.formatters import HtmlFormatter
except:
logger.critical("cannot import dependency: pygments")
from sys import exit
exit(1)
from datetime import datetime, timedelta
from urllib import urlencode
from urlparse import urlparse, urljoin
from werkzeug.contrib.fixers import ProxyFix
from flask import (
Flask, request, render_template, url_for, Response, make_response,
redirect, send_from_directory
)
from flask.ext.babel import Babel, gettext, format_date
from searx import settings, searx_dir
from searx.engines import (
categories, engines, get_engines_stats, engine_shortcuts
)
from searx.utils import (
UnicodeWriter, highlight_content, html_to_text, get_themes,
get_static_files, get_result_templates, gen_useragent, dict_subset,
prettify_url
)
from searx.version import VERSION_STRING
from searx.languages import language_codes
from searx.search import Search
from searx.query import Query
from searx.autocomplete import searx_bang, backends as autocomplete_backends
from searx.plugins import plugins
from searx.preferences import Preferences
# check if the pyopenssl, ndg-httpsclient, pyasn1 packages are installed.
# They are needed for SSL connection without trouble, see #298
try:
import OpenSSL.SSL # NOQA
import ndg.httpsclient # NOQA
import pyasn1 # NOQA
except ImportError:
logger.critical("The pyopenssl, ndg-httpsclient, pyasn1 packages have to be installed.\n"
"Some HTTPS connections will failed")
static_path, templates_path, themes =\
get_themes(settings['ui']['themes_path']
if settings['ui']['themes_path']
else searx_dir)
default_theme = settings['ui']['default_theme']
static_files = get_static_files(searx_dir)
result_templates = get_result_templates(searx_dir)
app = Flask(
__name__,
static_folder=static_path,
template_folder=templates_path
)
app.jinja_env.trim_blocks = True
app.jinja_env.lstrip_blocks = True
app.secret_key = settings['server']['secret_key']
babel = Babel(app)
rtl_locales = ['ar', 'arc', 'bcc', 'bqi', 'ckb', 'dv', 'fa', 'glk', 'he',
'ku', 'mzn', 'pnb'', ''ps', 'sd', 'ug', 'ur', 'yi']
global_favicons = []
for indice, theme in enumerate(themes):
global_favicons.append([])
theme_img_path = searx_dir + "/static/themes/" + theme + "/img/icons/"
for (dirpath, dirnames, filenames) in os.walk(theme_img_path):
global_favicons[indice].extend(filenames)
_category_names = (gettext('files'),
gettext('general'),
gettext('music'),
gettext('social media'),
gettext('images'),
gettext('videos'),
gettext('it'),
gettext('news'),
gettext('map'),
gettext('science'))
outgoing_proxies = settings['outgoing'].get('proxies', None)
@babel.localeselector
def get_locale():
locale = request.accept_languages.best_match(settings['locales'].keys())
if settings['ui'].get('default_locale'):
locale = settings['ui']['default_locale']
if request.cookies.get('locale', '') in settings['locales']:
locale = request.cookies.get('locale', '')
if 'locale' in request.args\
and request.args['locale'] in settings['locales']:
locale = request.args['locale']
if 'locale' in request.form\
and request.form['locale'] in settings['locales']:
locale = request.form['locale']
return locale
# code-highlighter
@app.template_filter('code_highlighter')
def code_highlighter(codelines, language=None):
if not language:
language = 'text'
try:
# find lexer by programing language
lexer = get_lexer_by_name(language, stripall=True)
except:
# if lexer is not found, using default one
logger.debug('highlighter cannot find lexer for {0}'.format(language))
lexer = get_lexer_by_name('text', stripall=True)
html_code = ''
tmp_code = ''
last_line = None
# parse lines
for line, code in codelines:
if not last_line:
line_code_start = line
# new codeblock is detected
if last_line is not None and\
last_line + 1 != line:
# highlight last codepart
formatter = HtmlFormatter(linenos='inline',
linenostart=line_code_start)
html_code = html_code + highlight(tmp_code, lexer, formatter)
# reset conditions for next codepart
tmp_code = ''
line_code_start = line
# add codepart
tmp_code += code + '\n'
# update line
last_line = line
# highlight last codepart
formatter = HtmlFormatter(linenos='inline', linenostart=line_code_start)
html_code = html_code + highlight(tmp_code, lexer, formatter)
return html_code
# Extract domain from url
@app.template_filter('extract_domain')
def extract_domain(url):
return urlparse(url)[1]
def get_base_url():
if settings['server']['base_url']:
hostname = settings['server']['base_url']
else:
scheme = 'http'
if request.is_secure:
scheme = 'https'
hostname = url_for('index', _external=True, _scheme=scheme)
return hostname
def get_current_theme_name(override=None):
"""Returns theme name.
Checks in this order:
1. override
2. cookies
3. settings"""
if override and override in themes:
return override
theme_name = request.args.get('theme', request.preferences.get_value('theme'))
if theme_name not in themes:
theme_name = default_theme
return theme_name
def get_result_template(theme, template_name):
themed_path = theme + '/result_templates/' + template_name
if themed_path in result_templates:
return themed_path
return 'result_templates/' + template_name
def url_for_theme(endpoint, override_theme=None, **values):
if endpoint == 'static' and values.get('filename'):
theme_name = get_current_theme_name(override=override_theme)
filename_with_theme = "themes/{}/{}".format(theme_name, values['filename'])
if filename_with_theme in static_files:
values['filename'] = filename_with_theme
return url_for(endpoint, **values)
def image_proxify(url):
if url.startswith('//'):
url = 'https:' + url
if not settings['server'].get('image_proxy') and not request.cookies.get('image_proxy'):
return url
hash_string = url + settings['server']['secret_key']
h = hashlib.sha256(hash_string.encode('utf-8')).hexdigest()
return '{0}?{1}'.format(url_for('image_proxy'),
urlencode(dict(url=url.encode('utf-8'), h=h)))
def render(template_name, override_theme=None, **kwargs):
blocked_engines = request.preferences.engines.get_disabled()
autocomplete = request.preferences.get_value('autocomplete')
nonblocked_categories = set(category for engine_name in engines
for category in engines[engine_name].categories
if (engine_name, category) not in blocked_engines)
if 'categories' not in kwargs:
kwargs['categories'] = ['general']
kwargs['categories'].extend(x for x in
sorted(categories.keys())
if x != 'general'
and x in nonblocked_categories)
if 'all_categories' not in kwargs:
kwargs['all_categories'] = ['general']
kwargs['all_categories'].extend(x for x in
sorted(categories.keys())
if x != 'general')
if 'selected_categories' not in kwargs:
kwargs['selected_categories'] = []
for arg in request.args:
if arg.startswith('category_'):
c = arg.split('_', 1)[1]
if c in categories:
kwargs['selected_categories'].append(c)
if not kwargs['selected_categories']:
cookie_categories = request.preferences.get_value('categories')
for ccateg in cookie_categories:
if ccateg in categories:
kwargs['selected_categories'].append(ccateg)
if not kwargs['selected_categories']:
kwargs['selected_categories'] = ['general']
if 'autocomplete' not in kwargs:
kwargs['autocomplete'] = autocomplete
if get_locale() in rtl_locales and 'rtl' not in kwargs:
kwargs['rtl'] = True
kwargs['searx_version'] = VERSION_STRING
kwargs['method'] = request.preferences.get_value('method')
kwargs['safesearch'] = str(request.preferences.get_value('safesearch'))
# override url_for function in templates
kwargs['url_for'] = url_for_theme
kwargs['image_proxify'] = image_proxify
kwargs['get_result_template'] = get_result_template
kwargs['theme'] = get_current_theme_name(override=override_theme)
kwargs['template_name'] = template_name
kwargs['cookies'] = request.cookies
kwargs['instance_name'] = settings['general']['instance_name']
kwargs['scripts'] = set()
for plugin in request.user_plugins:
for script in plugin.js_dependencies:
kwargs['scripts'].add(script)
kwargs['styles'] = set()
for plugin in request.user_plugins:
for css in plugin.css_dependencies:
kwargs['styles'].add(css)
return render_template(
'{}/{}'.format(kwargs['theme'], template_name), **kwargs)
@app.before_request
def pre_request():
# merge GET, POST vars
preferences = Preferences(themes, categories.keys(), engines, plugins)
preferences.parse_cookies(request.cookies)
request.preferences = preferences
request.form = dict(request.form.items())
for k, v in request.args.items():
if k not in request.form:
request.form[k] = v
request.user_plugins = []
allowed_plugins = preferences.plugins.get_enabled()
disabled_plugins = preferences.plugins.get_disabled()
for plugin in plugins:
if ((plugin.default_on and plugin.id not in disabled_plugins)
or plugin.id in allowed_plugins):
request.user_plugins.append(plugin)
@app.route('/search', methods=['GET', 'POST'])
@app.route('/', methods=['GET', 'POST'])
def index():
"""Render index page.
Supported outputs: html, json, csv, rss.
"""
if not request.args and not request.form:
return render(
'index.html',
)
try:
search = Search(request)
except:
return render(
'index.html',
)
if plugins.call('pre_search', request, locals()):
search.search(request)
plugins.call('post_search', request, locals())
for result in search.result_container.get_ordered_results():
plugins.call('on_result', request, locals())
if not search.paging and engines[result['engine']].paging:
search.paging = True
if search.request_data.get('format', 'html') == 'html':
if 'content' in result:
result['content'] = highlight_content(result['content'],
search.query.encode('utf-8')) # noqa
result['title'] = highlight_content(result['title'],
search.query.encode('utf-8'))
else:
if result.get('content'):
result['content'] = html_to_text(result['content']).strip()
# removing html content and whitespace duplications
result['title'] = ' '.join(html_to_text(result['title']).strip().split())
result['pretty_url'] = prettify_url(result['url'])
# TODO, check if timezone is calculated right
if 'publishedDate' in result:
try: # test if publishedDate >= 1900 (datetime module bug)
result['pubdate'] = result['publishedDate'].strftime('%Y-%m-%d %H:%M:%S%z')
except ValueError:
result['publishedDate'] = None
else:
if result['publishedDate'].replace(tzinfo=None) >= datetime.now() - timedelta(days=1):
timedifference = datetime.now() - result['publishedDate'].replace(tzinfo=None)
minutes = int((timedifference.seconds / 60) % 60)
hours = int(timedifference.seconds / 60 / 60)
if hours == 0:
result['publishedDate'] = gettext(u'{minutes} minute(s) ago').format(minutes=minutes)
else:
result['publishedDate'] = gettext(u'{hours} hour(s), {minutes} minute(s) ago').format(hours=hours, minutes=minutes) # noqa
else:
result['publishedDate'] = format_date(result['publishedDate'])
if search.request_data.get('format') == 'json':
return Response(json.dumps({'query': search.query,
'results': search.result_container.get_ordered_results()}),
mimetype='application/json')
elif search.request_data.get('format') == 'csv':
csv = UnicodeWriter(cStringIO.StringIO())
keys = ('title', 'url', 'content', 'host', 'engine', 'score')
csv.writerow(keys)
for row in search.result_container.get_ordered_results():
row['host'] = row['parsed_url'].netloc
csv.writerow([row.get(key, '') for key in keys])
csv.stream.seek(0)
response = Response(csv.stream.read(), mimetype='application/csv')
cont_disp = 'attachment;Filename=searx_-_{0}.csv'.format(search.query.encode('utf-8'))
response.headers.add('Content-Disposition', cont_disp)
return response
elif search.request_data.get('format') == 'rss':
response_rss = render(
'opensearch_response_rss.xml',
results=search.result_container.get_ordered_results(),
q=search.request_data['q'],
number_of_results=search.result_container.results_length(),
base_url=get_base_url()
)
return Response(response_rss, mimetype='text/xml')
return render(
'results.html',
results=search.result_container.get_ordered_results(),
q=search.request_data['q'],
selected_categories=search.categories,
paging=search.paging,
pageno=search.pageno,
base_url=get_base_url(),
suggestions=search.result_container.suggestions,
answers=search.result_container.answers,
infoboxes=search.result_container.infoboxes,
theme=get_current_theme_name(),
favicons=global_favicons[themes.index(get_current_theme_name())]
)
@app.route('/about', methods=['GET'])
def about():
"""Render about page"""
return render(
'about.html',
)
@app.route('/autocompleter', methods=['GET', 'POST'])
def autocompleter():
"""Return autocompleter results"""
request_data = {}
# select request method
if request.method == 'POST':
request_data = request.form
else:
request_data = request.args
# set blocked engines
blocked_engines = request.preferences.engines.get_disabled()
# parse query
query = Query(request_data.get('q', '').encode('utf-8'), blocked_engines)
query.parse_query()
# check if search query is set
if not query.getSearchQuery():
return '', 400
# run autocompleter
completer = autocomplete_backends.get(request.preferences.get_value('autocomplete'))
# parse searx specific autocompleter results like !bang
raw_results = searx_bang(query)
# normal autocompletion results only appear if max 3 inner results returned
if len(raw_results) <= 3 and completer:
# get language from cookie
language = request.cookies.get('language')
if not language or language == 'all':
language = 'en'
else:
language = language.split('_')[0]
# run autocompletion
raw_results.extend(completer(query.getSearchQuery(), language))
# parse results (write :language and !engine back to result string)
results = []
for result in raw_results:
query.changeSearchQuery(result)
# add parsed result
results.append(query.getFullQuery())
# return autocompleter results
if request_data.get('format') == 'x-suggestions':
return Response(json.dumps([query.query, results]),
mimetype='application/json')
return Response(json.dumps(results),
mimetype='application/json')
@app.route('/preferences', methods=['GET', 'POST'])
def preferences():
"""Render preferences page && save user preferences"""
# save preferences
if request.method == 'POST':
resp = make_response(redirect(urljoin(settings['server']['base_url'], url_for('index'))))
try:
request.preferences.parse_form(request.form)
except ValidationException:
# TODO use flash feature of flask
return resp
return request.preferences.save(resp)
# render preferences
image_proxy = request.preferences.get_value('image_proxy')
lang = request.preferences.get_value('language')
blocked_engines = request.preferences.engines.get_disabled()
allowed_plugins = request.preferences.plugins.get_enabled()
# stats for preferences page
stats = {}
for c in categories:
for e in categories[c]:
stats[e.name] = {'time': None,
'warn_timeout': False,
'warn_time': False}
if e.timeout > settings['outgoing']['request_timeout']:
stats[e.name]['warn_timeout'] = True
for engine_stat in get_engines_stats()[0][1]:
stats[engine_stat.get('name')]['time'] = round(engine_stat.get('avg'), 3)
if engine_stat.get('avg') > settings['outgoing']['request_timeout']:
stats[engine_stat.get('name')]['warn_time'] = True
# end of stats
return render('preferences.html',
locales=settings['locales'],
current_locale=get_locale(),
current_language=lang,
image_proxy=image_proxy,
language_codes=language_codes,
engines_by_category=categories,
stats=stats,
blocked_engines=blocked_engines,
autocomplete_backends=autocomplete_backends,
shortcuts={y: x for x, y in engine_shortcuts.items()},
themes=themes,
plugins=plugins,
allowed_plugins=allowed_plugins,
theme=get_current_theme_name())
@app.route('/image_proxy', methods=['GET'])
def image_proxy():
url = request.args.get('url').encode('utf-8')
if not url:
return '', 400
h = hashlib.sha256(url + settings['server']['secret_key'].encode('utf-8')).hexdigest()
if h != request.args.get('h'):
return '', 400
headers = dict_subset(request.headers, {'If-Modified-Since', 'If-None-Match'})
headers['User-Agent'] = gen_useragent()
resp = requests.get(url,
stream=True,
timeout=settings['outgoing']['request_timeout'],
headers=headers,
proxies=outgoing_proxies)
if resp.status_code == 304:
return '', resp.status_code
if resp.status_code != 200:
logger.debug('image-proxy: wrong response code: {0}'.format(resp.status_code))
if resp.status_code >= 400:
return '', resp.status_code
return '', 400
if not resp.headers.get('content-type', '').startswith('image/'):
logger.debug('image-proxy: wrong content-type: {0}'.format(resp.headers.get('content-type')))
return '', 400
img = ''
chunk_counter = 0
for chunk in resp.iter_content(1024 * 1024):
chunk_counter += 1
if chunk_counter > 5:
return '', 502 # Bad gateway - file is too big (>5M)
img += chunk
headers = dict_subset(resp.headers, {'Content-Length', 'Length', 'Date', 'Last-Modified', 'Expires', 'Etag'})
return Response(img, mimetype=resp.headers['content-type'], headers=headers)
@app.route('/stats', methods=['GET'])
def stats():
"""Render engine statistics page."""
stats = get_engines_stats()
return render(
'stats.html',
stats=stats,
)
@app.route('/robots.txt', methods=['GET'])
def robots():
return Response("""User-agent: *
Allow: /
Allow: /about
Disallow: /stats
Disallow: /preferences
""", mimetype='text/plain')
@app.route('/opensearch.xml', methods=['GET'])
def opensearch():
method = 'post'
if request.preferences.get_value('method') == 'GET':
method = 'get'
# chrome/chromium only supports HTTP GET....
if request.headers.get('User-Agent', '').lower().find('webkit') >= 0:
method = 'get'
ret = render('opensearch.xml',
opensearch_method=method,
host=get_base_url(),
urljoin=urljoin)
resp = Response(response=ret,
status=200,
mimetype="text/xml")
return resp
@app.route('/favicon.ico')
def favicon():
return send_from_directory(os.path.join(app.root_path,
'static/themes',
get_current_theme_name(),
'img'),
'favicon.png',
mimetype='image/vnd.microsoft.icon')
@app.route('/clear_cookies')
def clear_cookies():
resp = make_response(redirect(urljoin(settings['server']['base_url'], url_for('index'))))
for cookie_name in request.cookies:
resp.delete_cookie(cookie_name)
return resp
def run():
app.run(
debug=settings['general']['debug'],
use_debugger=settings['general']['debug'],
port=settings['server']['port'],
host=settings['server']['bind_address']
)
class ReverseProxyPathFix(object):
'''Wrap the application in this middleware and configure the
front-end server to add these headers, to let you quietly bind
this to a URL other than / and to an HTTP scheme that is
different than what is used locally.
http://flask.pocoo.org/snippets/35/
In nginx:
location /myprefix {
proxy_pass http://127.0.0.1:8000;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Scheme $scheme;
proxy_set_header X-Script-Name /myprefix;
}
:param app: the WSGI application
'''
def __init__(self, app):
self.app = app
def __call__(self, environ, start_response):
script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
if script_name:
environ['SCRIPT_NAME'] = script_name
path_info = environ['PATH_INFO']
if path_info.startswith(script_name):
environ['PATH_INFO'] = path_info[len(script_name):]
scheme = environ.get('HTTP_X_SCHEME', '')
if scheme:
environ['wsgi.url_scheme'] = scheme
return self.app(environ, start_response)
application = app
# patch app to handle non root url-s behind proxy & wsgi
app.wsgi_app = ReverseProxyPathFix(ProxyFix(application.wsgi_app))
if __name__ == "__main__":
run()